<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.8">
<title>clCreateFromGLRenderbuffer(3)</title>
<style>
/*! normalize.css v2.1.2 | MIT License | git.io/normalize */
/* ========================================================================== HTML5 display definitions ========================================================================== */
/** Correct `block` display not defined in IE 8/9. */
article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary { display: block; }

/** Correct `inline-block` display not defined in IE 8/9. */
audio, canvas, video { display: inline-block; }

/** Prevent modern browsers from displaying `audio` without controls. Remove excess height in iOS 5 devices. */
audio:not([controls]) { display: none; height: 0; }

/** Address `[hidden]` styling not present in IE 8/9. Hide the `template` element in IE, Safari, and Firefox < 22. */
[hidden], template { display: none; }

script { display: none !important; }

/* ========================================================================== Base ========================================================================== */
/** 1. Set default font family to sans-serif. 2. Prevent iOS text size adjust after orientation change, without disabling user zoom. */
html { font-family: sans-serif; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */ }

/** Remove default margin. */
body { margin: 0; }

/* ========================================================================== Links ========================================================================== */
/** Remove the gray background color from active links in IE 10. */
a { background: transparent; }

/** Address `outline` inconsistency between Chrome and other browsers. */
a:focus { outline: thin dotted; }

/** Improve readability when focused and also mouse hovered in all browsers. */
a:active, a:hover { outline: 0; }

/* ========================================================================== Typography ========================================================================== */
/** Address variable `h1` font-size and margin within `section` and `article` contexts in Firefox 4+, Safari 5, and Chrome. */
h1 { font-size: 2em; margin: 0.67em 0; }

/** Address styling not present in IE 8/9, Safari 5, and Chrome. */
abbr[title] { border-bottom: 1px dotted; }

/** Address style set to `bolder` in Firefox 4+, Safari 5, and Chrome. */
b, strong { font-weight: bold; }

/** Address styling not present in Safari 5 and Chrome. */
dfn { font-style: italic; }

/** Address differences between Firefox and other browsers. */
hr { -moz-box-sizing: content-box; box-sizing: content-box; height: 0; }

/** Address styling not present in IE 8/9. */
mark { background: #ff0; color: #000; }

/** Correct font family set oddly in Safari 5 and Chrome. */
code, kbd, pre, samp { font-family: monospace, serif; font-size: 1em; }

/** Improve readability of pre-formatted text in all browsers. */
pre { white-space: pre-wrap; }

/** Set consistent quote types. */
q { quotes: "\201C" "\201D" "\2018" "\2019"; }

/** Address inconsistent and variable font size in all browsers. */
small { font-size: 80%; }

/** Prevent `sub` and `sup` affecting `line-height` in all browsers. */
sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }

sup { top: -0.5em; }

sub { bottom: -0.25em; }

/* ========================================================================== Embedded content ========================================================================== */
/** Remove border when inside `a` element in IE 8/9. */
img { border: 0; }

/** Correct overflow displayed oddly in IE 9. */
svg:not(:root) { overflow: hidden; }

/* ========================================================================== Figures ========================================================================== */
/** Address margin not present in IE 8/9 and Safari 5. */
figure { margin: 0; }

/* ========================================================================== Forms ========================================================================== */
/** Define consistent border, margin, and padding. */
fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em; }

/** 1. Correct `color` not being inherited in IE 8/9. 2. Remove padding so people aren't caught out if they zero out fieldsets. */
legend { border: 0; /* 1 */ padding: 0; /* 2 */ }

/** 1. Correct font family not being inherited in all browsers. 2. Correct font size not being inherited in all browsers. 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome. */
button, input, select, textarea { font-family: inherit; /* 1 */ font-size: 100%; /* 2 */ margin: 0; /* 3 */ }

/** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */
button, input { line-height: normal; }

/** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */
button, select { text-transform: none; }

/** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */
button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button; /* 2 */ cursor: pointer; /* 3 */ }

/** Re-set default cursor for disabled elements. */
button[disabled], html input[disabled] { cursor: default; }

/** 1. Address box sizing set to `content-box` in IE 8/9. 2. Remove excess padding in IE 8/9. */
input[type="checkbox"], input[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */ }

/** 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome. 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome (include `-moz` to future-proof). */
input[type="search"] { -webkit-appearance: textfield; /* 1 */ -moz-box-sizing: content-box; -webkit-box-sizing: content-box; /* 2 */ box-sizing: content-box; }

/** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */
input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }

/** Remove inner padding and border in Firefox 4+. */
button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }

/** 1. Remove default vertical scrollbar in IE 8/9. 2. Improve readability and alignment in all browsers. */
textarea { overflow: auto; /* 1 */ vertical-align: top; /* 2 */ }

/* ========================================================================== Tables ========================================================================== */
/** Remove most spacing between table cells. */
table { border-collapse: collapse; border-spacing: 0; }

meta.foundation-mq-small { font-family: "only screen and (min-width: 768px)"; width: 768px; }

meta.foundation-mq-medium { font-family: "only screen and (min-width:1280px)"; width: 1280px; }

meta.foundation-mq-large { font-family: "only screen and (min-width:1440px)"; width: 1440px; }

*, *:before, *:after { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; }

html, body { font-size: 100%; }

body { background: white; color: #222222; padding: 0; margin: 0; font-family: "Helvetica Neue", "Helvetica", Helvetica, Arial, sans-serif; font-weight: normal; font-style: normal; line-height: 1; position: relative; cursor: auto; }

a:hover { cursor: pointer; }

img, object, embed { max-width: 100%; height: auto; }

object, embed { height: 100%; }

img { -ms-interpolation-mode: bicubic; }

#map_canvas img, #map_canvas embed, #map_canvas object, .map_canvas img, .map_canvas embed, .map_canvas object { max-width: none !important; }

.left { float: left !important; }

.right { float: right !important; }

.text-left { text-align: left !important; }

.text-right { text-align: right !important; }

.text-center { text-align: center !important; }

.text-justify { text-align: justify !important; }

.hide { display: none; }

.antialiased { -webkit-font-smoothing: antialiased; }

img { display: inline-block; vertical-align: middle; }

textarea { height: auto; min-height: 50px; }

select { width: 100%; }

object, svg { display: inline-block; vertical-align: middle; }

.center { margin-left: auto; margin-right: auto; }

.spread { width: 100%; }

p.lead, .paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { font-size: 1.21875em; line-height: 1.6; }

.subheader, .admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { line-height: 1.4; color: black; font-weight: 300; margin-top: 0.2em; margin-bottom: 0.5em; }

/* Typography resets */
div, dl, dt, dd, ul, ol, li, h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, pre, form, p, blockquote, th, td { margin: 0; padding: 0; direction: ltr; }

/* Default Link Styles */
a { color: #0068b0; text-decoration: none; line-height: inherit; }
a:hover, a:focus { color: #333333; }
a img { border: none; }

/* Default paragraph styles */
p { font-family: Noto, sans-serif; font-weight: normal; font-size: 1em; line-height: 1.6; margin-bottom: 0.75em; text-rendering: optimizeLegibility; }
p aside { font-size: 0.875em; line-height: 1.35; font-style: italic; }

/* Default header styles */
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { font-family: Noto, sans-serif; font-weight: normal; font-style: normal; color: black; text-rendering: optimizeLegibility; margin-top: 0.5em; margin-bottom: 0.5em; line-height: 1.2125em; }
h1 small, h2 small, h3 small, #toctitle small, .sidebarblock > .content > .title small, h4 small, h5 small, h6 small { font-size: 60%; color: #4d4d4d; line-height: 0; }

h1 { font-size: 2.125em; }

h2 { font-size: 1.6875em; }

h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.375em; }

h4 { font-size: 1.125em; }

h5 { font-size: 1.125em; }

h6 { font-size: 1em; }

hr { border: solid #dddddd; border-width: 1px 0 0; clear: both; margin: 1.25em 0 1.1875em; height: 0; }

/* Helpful Typography Defaults */
em, i { font-style: italic; line-height: inherit; }

strong, b { font-weight: bold; line-height: inherit; }

small { font-size: 60%; line-height: inherit; }

code { font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; color: #264357; }

/* Lists */
ul, ol, dl { font-size: 1em; line-height: 1.6; margin-bottom: 0.75em; list-style-position: outside; font-family: Noto, sans-serif; }

ul, ol { margin-left: 1.5em; }
ul.no-bullet, ol.no-bullet { margin-left: 1.5em; }

/* Unordered Lists */
ul li ul, ul li ol { margin-left: 1.25em; margin-bottom: 0; font-size: 1em; /* Override nested font-size change */ }
ul.square li ul, ul.circle li ul, ul.disc li ul { list-style: inherit; }
ul.square { list-style-type: square; }
ul.circle { list-style-type: circle; }
ul.disc { list-style-type: disc; }
ul.no-bullet { list-style: none; }

/* Ordered Lists */
ol li ul, ol li ol { margin-left: 1.25em; margin-bottom: 0; }

/* Definition Lists */
dl dt { margin-bottom: 0.3em; font-weight: bold; }
dl dd { margin-bottom: 0.75em; }

/* Abbreviations */
abbr, acronym { text-transform: uppercase; font-size: 90%; color: black; border-bottom: 1px dotted #dddddd; cursor: help; }

abbr { text-transform: none; }

/* Blockquotes */
blockquote { margin: 0 0 0.75em; padding: 0.5625em 1.25em 0 1.1875em; border-left: 1px solid #dddddd; }
blockquote cite { display: block; font-size: 0.8125em; color: #5e93b8; }
blockquote cite:before { content: "\2014 \0020"; }
blockquote cite a, blockquote cite a:visited { color: #5e93b8; }

blockquote, blockquote p { line-height: 1.6; color: #333333; }

/* Microformats */
.vcard { display: inline-block; margin: 0 0 1.25em 0; border: 1px solid #dddddd; padding: 0.625em 0.75em; }
.vcard li { margin: 0; display: block; }
.vcard .fn { font-weight: bold; font-size: 0.9375em; }

.vevent .summary { font-weight: bold; }
.vevent abbr { cursor: auto; text-decoration: none; font-weight: bold; border: none; padding: 0 0.0625em; }

@media only screen and (min-width: 768px) { h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }
  h1 { font-size: 2.75em; }
  h2 { font-size: 2.3125em; }
  h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.6875em; }
  h4 { font-size: 1.4375em; } }
/* Tables */
table { background: white; margin-bottom: 1.25em; border: solid 1px #d8d8ce; }
table thead, table tfoot { background: -webkit-linear-gradient(top, #add386, #90b66a); font-weight: bold; }
table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td { padding: 0.5em 0.625em 0.625em; font-size: inherit; color: white; text-align: left; }
table tr th, table tr td { padding: 0.5625em 0.625em; font-size: inherit; color: #6d6e71; }
table tr.even, table tr.alt, table tr:nth-of-type(even) { background: #edf2f2; }
table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td { display: table-cell; line-height: 1.4; }

body { -moz-osx-font-smoothing: grayscale; -webkit-font-smoothing: antialiased; tab-size: 4; }

h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }

a:hover, a:focus { text-decoration: underline; }

.clearfix:before, .clearfix:after, .float-group:before, .float-group:after { content: " "; display: table; }
.clearfix:after, .float-group:after { clear: both; }

*:not(pre) > code { font-size: inherit; font-style: normal !important; letter-spacing: 0; padding: 0; background-color: white; -webkit-border-radius: 0; border-radius: 0; line-height: inherit; word-wrap: break-word; }
*:not(pre) > code.nobreak { word-wrap: normal; }
*:not(pre) > code.nowrap { white-space: nowrap; }

pre, pre > code { line-height: 1.6; color: #264357; font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; }

em em { font-style: normal; }

strong strong { font-weight: normal; }

.keyseq { color: #333333; }

kbd { font-family: Consolas, "Liberation Mono", Courier, monospace; display: inline-block; color: black; font-size: 0.65em; line-height: 1.45; background-color: #f7f7f7; border: 1px solid #ccc; -webkit-border-radius: 3px; border-radius: 3px; -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; margin: 0 0.15em; padding: 0.2em 0.5em; vertical-align: middle; position: relative; top: -0.1em; white-space: nowrap; }

.keyseq kbd:first-child { margin-left: 0; }

.keyseq kbd:last-child { margin-right: 0; }

.menuseq, .menuref { color: #000; }

.menuseq b:not(.caret), .menuref { font-weight: inherit; }

.menuseq { word-spacing: -0.02em; }
.menuseq b.caret { font-size: 1.25em; line-height: 0.8; }
.menuseq i.caret { font-weight: bold; text-align: center; width: 0.45em; }

b.button:before, b.button:after { position: relative; top: -1px; font-weight: normal; }

b.button:before { content: "["; padding: 0 3px 0 2px; }

b.button:after { content: "]"; padding: 0 2px 0 3px; }

#header, #content, #footnotes, #footer { width: 100%; margin-left: auto; margin-right: auto; margin-top: 0; margin-bottom: 0; max-width: 62.5em; *zoom: 1; position: relative; padding-left: 1.5em; padding-right: 1.5em; }
#header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after { content: " "; display: table; }
#header:after, #content:after, #footnotes:after, #footer:after { clear: both; }

#content { margin-top: 1.25em; }

#content:before { content: none; }

#header > h1:first-child { color: black; margin-top: 2.25rem; margin-bottom: 0; }
#header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #dddddd; }
#header > h1:only-child, body.toc2 #header > h1:nth-last-child(2) { border-bottom: 1px solid #dddddd; padding-bottom: 8px; }
#header .details { border-bottom: 1px solid #dddddd; line-height: 1.45; padding-top: 0.25em; padding-bottom: 0.25em; padding-left: 0.25em; color: #5e93b8; display: -ms-flexbox; display: -webkit-flex; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; }
#header .details span:first-child { margin-left: -0.125em; }
#header .details span.email a { color: #333333; }
#header .details br { display: none; }
#header .details br + span:before { content: "\00a0\2013\00a0"; }
#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #333333; }
#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
#header #revnumber { text-transform: capitalize; }
#header #revnumber:after { content: "\00a0"; }

#content > h1:first-child:not([class]) { color: black; border-bottom: 1px solid #dddddd; padding-bottom: 8px; margin-top: 0; padding-top: 1rem; margin-bottom: 1.25rem; }

#toc { border-bottom: 0 solid #dddddd; padding-bottom: 0.5em; }
#toc > ul { margin-left: 0.125em; }
#toc ul.sectlevel0 > li > a { font-style: italic; }
#toc ul.sectlevel0 ul.sectlevel1 { margin: 0.5em 0; }
#toc ul { font-family: Noto, sans-serif; list-style-type: none; }
#toc li { line-height: 1.3334; margin-top: 0.3334em; }
#toc a { text-decoration: none; }
#toc a:active { text-decoration: underline; }

#toctitle { color: black; font-size: 1.2em; }

@media only screen and (min-width: 768px) { #toctitle { font-size: 1.375em; }
  body.toc2 { padding-left: 15em; padding-right: 0; }
  #toc.toc2 { margin-top: 0 !important; background-color: white; position: fixed; width: 15em; left: 0; top: 0; border-right: 1px solid #dddddd; border-top-width: 0 !important; border-bottom-width: 0 !important; z-index: 1000; padding: 1.25em 1em; height: 100%; overflow: auto; }
  #toc.toc2 #toctitle { margin-top: 0; margin-bottom: 0.8rem; font-size: 1.2em; }
  #toc.toc2 > ul { font-size: 0.9em; margin-bottom: 0; }
  #toc.toc2 ul ul { margin-left: 0; padding-left: 1em; }
  #toc.toc2 ul.sectlevel0 ul.sectlevel1 { padding-left: 0; margin-top: 0.5em; margin-bottom: 0.5em; }
  body.toc2.toc-right { padding-left: 0; padding-right: 15em; }
  body.toc2.toc-right #toc.toc2 { border-right-width: 0; border-left: 1px solid #dddddd; left: auto; right: 0; } }
@media only screen and (min-width: 1280px) { body.toc2 { padding-left: 20em; padding-right: 0; }
  #toc.toc2 { width: 20em; }
  #toc.toc2 #toctitle { font-size: 1.375em; }
  #toc.toc2 > ul { font-size: 0.95em; }
  #toc.toc2 ul ul { padding-left: 1.25em; }
  body.toc2.toc-right { padding-left: 0; padding-right: 20em; } }
#content #toc { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
#content #toc > :first-child { margin-top: 0; }
#content #toc > :last-child { margin-bottom: 0; }

#footer { max-width: 100%; background-color: none; padding: 1.25em; }

#footer-text { color: black; line-height: 1.44; }

#content { margin-bottom: 0.625em; }

.sect1 { padding-bottom: 0.625em; }

@media only screen and (min-width: 768px) { #content { margin-bottom: 1.25em; }
  .sect1 { padding-bottom: 1.25em; } }
.sect1:last-child { padding-bottom: 0; }

.sect1 + .sect1 { border-top: 0 solid #dddddd; }

#content h1 > a.anchor, h2 > a.anchor, h3 > a.anchor, #toctitle > a.anchor, .sidebarblock > .content > .title > a.anchor, h4 > a.anchor, h5 > a.anchor, h6 > a.anchor { position: absolute; z-index: 1001; width: 1.5ex; margin-left: -1.5ex; display: block; text-decoration: none !important; visibility: hidden; text-align: center; font-weight: normal; }
#content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before { content: "\00A7"; font-size: 0.85em; display: block; padding-top: 0.1em; }
#content h1:hover > a.anchor, #content h1 > a.anchor:hover, h2:hover > a.anchor, h2 > a.anchor:hover, h3:hover > a.anchor, #toctitle:hover > a.anchor, .sidebarblock > .content > .title:hover > a.anchor, h3 > a.anchor:hover, #toctitle > a.anchor:hover, .sidebarblock > .content > .title > a.anchor:hover, h4:hover > a.anchor, h4 > a.anchor:hover, h5:hover > a.anchor, h5 > a.anchor:hover, h6:hover > a.anchor, h6 > a.anchor:hover { visibility: visible; }
#content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link { color: black; text-decoration: none; }
#content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover { color: black; }

.audioblock, .imageblock, .literalblock, .listingblock, .stemblock, .videoblock { margin-bottom: 1.25em; }

.admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; }

table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; }

.paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: black; }

table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; }

.admonitionblock > table { border-collapse: separate; border: 0; background: none; width: 100%; }
.admonitionblock > table td.icon { text-align: center; width: 80px; }
.admonitionblock > table td.icon img { max-width: initial; }
.admonitionblock > table td.icon .title { font-weight: bold; font-family: Noto, sans-serif; text-transform: uppercase; }
.admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #dddddd; color: #5e93b8; }
.admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; }

.exampleblock > .content { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.exampleblock > .content > :first-child { margin-top: 0; }
.exampleblock > .content > :last-child { margin-bottom: 0; }

.sidebarblock { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.sidebarblock > :first-child { margin-top: 0; }
.sidebarblock > :last-child { margin-bottom: 0; }
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<body class="manpage">
<div id="header">
<h1>clCreateFromGLRenderbuffer(3) Manual Page</h1>
<h2 id="_name">Name</h2>
<div class="sectionbody">
<p>clCreateFromGLRenderbuffer - Creates an OpenCL 2D image object from an OpenGL renderbuffer object.</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_c_specification">C Specification</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">cl_mem clCreateFromGLRenderbuffer(cl_context context,
                                  cl_mem_flags flags,
                                  GLuint renderbuffer,
                                  cl_int * errcode_ret)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_parameters">Parameters</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><em>context</em> - A valid OpenCL context created from an OpenGL context.</p>
</li>
<li>
<p><em>flags</em> - A bit-field that is used to specify usage information. Refer
to the table at <a href="clCreateBuffer.html">clCreateBuffer</a> for a description of <em>flags</em>. Only
<code>CL_MEM_READ_ONLY</code>, <code>CL_MEM_WRITE_ONLY</code>, and <code>CL_MEM_READ_WRITE</code> values
specified in the table at <a href="clCreateBuffer.html">clCreateBuffer</a> can be used.</p>
</li>
<li>
<p><em>renderbuffer</em> - The name of a GL renderbuffer object. The renderbuffer
storage must be specified before the image object can be created. The
<em>renderbuffer</em> format and dimensions defined by OpenGL will be used to
create the 2D image object. Only GL renderbuffers with internal formats
that map to appropriate image channel order and data type specified in
tables 5.5 and 5.6 (see <a href="cl_image_format.html">cl_image_format</a>) can be used to create
the 2D image object.</p>
</li>
<li>
<p><em>errcode_ret</em> - Returns an appropriate error code as described below. If
<em>errcode_ret</em> is NULL, no error code is returned.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If the state of a GL renderbuffer object is modified through the GL API (i.e.
changes to the dimensions or format used to represent pixels of the GL renderbuffer using appropriate GL API calls such as <code>glRenderbufferStorage</code>) while there exists a corresponding CL image object, subsequent use of the CL image object will result in undefined behavior.</p>
</div>
<div class="paragraph">
<p>The <a href="clRetainMemObject.html">clRetainMemObject</a> and
<a href="clReleaseMemObject.html">clReleaseMemObject</a> functions can be used to retain and release the image objects.</p>
</div>
<div class="paragraph">
<p>General information about GL sharing follows.</p>
</div>
<div class="paragraph">
<p>The OpenCL specification in section 9.7 defines how to share data with
texture and buffer objects in a parallel OpenGL implementation, but does not
define how the association between an OpenCL context and an OpenGL context
or share group is established. This extension defines optional attributes to
OpenCL context creation routines which associate a GL context or share group
object with a newly created OpenCL context. If this extension is supported
by an implementation, the string "cl_khr_gl_sharing" will be present in the
<code>CL_DEVICE_EXTENSIONS</code> string described in the table of allowed values for
<em>param_name</em> for <a href="clGetDeviceInfo.html">clGetDeviceInfo</a> or in the <code>CL_PLATFORM_EXTENSIONS</code>
string described in the table of allowed values for <em>param_name</em> for
<a href="clGetPlatformInfo.html">clGetPlatformInfo</a>.</p>
</div>
<div class="paragraph">
<p>This section discusses OpenCL functions that allow applications to use
OpenGL buffer, texture, and renderbuffer objects as OpenCL memory objects.
This allows efficient sharing of data between OpenCL and OpenGL. The OpenCL
API may be used to execute kernels that read and/or write memory objects
that are also OpenGL objects.</p>
</div>
<div class="paragraph">
<p>An OpenCL image object may be created from an OpenGL texture or renderbuffer
object. An OpenCL buffer object may be created from an OpenGL buffer object.</p>
</div>
<div class="paragraph">
<p>Any supported OpenGL object defined within the GL share group object, or the
share group associated with the GL context from which the CL context is
created, may be shared, with the exception of the default OpenGL objects
(i.e. objects named zero), which may not be shared.</p>
</div>
<div class="paragraph">
<div class="title">OpenGL and Corresponding OpenCL Image Formats</div>
<p>The table below (Table 9.4) describes the list of GL texture internal
formats and the corresponding CL image formats.
If a GL texture object with an internal format from the table below is
successfully created by OpenGL, then there is guaranteed to be a mapping to
one of the corresponding CL image format(s) in that table.
Texture objects created with other OpenGL internal formats may (but are not
guaranteed to) have a mapping to a CL image format; if such mappings exist,
they are guaranteed to preserve all color components, data types, and at
least the number of bits/component actually allocated by OpenGL for that
format.</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">GL internal format</th>
<th class="tableblock halign-left valign-top">CL image format (channel order, channel data type)</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA8</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_UNORM_INT8 or CL_BGRA, CL_UNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_SRGBA8_ALPHA8</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_sRGBA, CL_UNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA</code>,
  <code>GL_UNSIGNED_INT_8_8_8_8_REV</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_UNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_BGRA</code>,
  <code>GL_UNSIGNED_INT_8_8_8_8_REV</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_BGRA, CL_UNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA8I, GL_RGBA8I_EXT</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_SIGNED_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA16I, GL_RGBA16I_EXT</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_SIGNED_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA32I, GL_RGBA32I_EXT</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_SIGNED_INT32</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA8UI, GL_RGBA8UI_EXT</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_UNSIGNED_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA16UI, GL_RGBA16UI_EXT</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_UNSIGNED_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA32UI, GL_RGBA32UI_EXT</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_UNSIGNED_INT32</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA8_SNORM</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_SNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA16</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_UNORM_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA16_SNORM</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_SNORM_INT166</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA16F, GL_RGBA16F_ARB</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_HALF_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RGBA32F, GL_RGBA32F_ARB</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RGBA, CL_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R8</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_UNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R8_SNORM</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_SNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R16</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_UNORM_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R16_SNORM</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_SNORM_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R16F</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_HALF_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R32F</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R8I</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_SIGNED_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R16I</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_SIGNED_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R32I</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_SIGNED_INT32</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R8UI</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_UNSIGNED_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R16UI</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_UNSIGNED_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_R32UI</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_R, CL_UNSIGNED_INT32</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG8</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_UNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG8_SNORM</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_SNORM_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG16</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_UNORM_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG16_SNORM</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_SNORM_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG16F</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_HALF_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG32F</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG8I</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_SIGNED_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG16I</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_SIGNED_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG32I</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_SIGNED_INT32</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG8UI</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_UNSIGNED_INT8</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG16UI</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_UNSIGNED_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_RG32UI</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_RG, CL_UNSIGNED_INT32</code></p>
</div></div></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>If the <a href="cl_khr_gl_depth_images.html">cl_khr_gl_depth_images</a> extension is enabled, the following
new image formats are added to table 9.4 in section 9.6.3.1 of the OpenCL
2.0 extension specification. If a GL texture object with an internal format
from table 9.4 is successfully created by OpenGL, then there is guaranteed
to be a mapping to one of the corresponding CL image format(s) in that
table.</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">GL internal format</th>
<th class="tableblock halign-left valign-top">CL image format (channel order, channel data type)</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_DEPTH_COMPONENT32F</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_DEPTH, CL_FLOAT</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_DEPTH_COMPONENT16</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_DEPTH, CL_UNORM_INT16</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_DEPTH24_STENCIL8</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_DEPTH_STENCIL, CL_UNORM_INT24</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>GL_DEPTH32F_STENCIL8</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>CL_DEPTH_STENCIL, CL_FLOAT</code></p>
</div></div></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<div class="title">Lifetime of [GL] Shared Objects</div>
<p>An OpenCL memory object created from an OpenGL object (hereinafter refered
to as a "shared CL/GL object") remains valid as long as the corresponding GL
object has not been deleted. If the GL object is deleted through the GL API
(e.g. <code>glDeleteBuffers</code>, <code>glDeleteTextures</code>, or <code>glDeleteRenderbuffers</code>),
subsequent use of the CL buffer or image object will result in undefined
behavior, including but not limited to possible CL errors and data
corruption, but may not result in program termination.</p>
</div>
<div class="paragraph">
<p>The CL context and corresponding command-queues are dependent on the
existence of the GL share group object, or the share group associated with
the GL context from which the CL context is created. If the GL share group
object or all GL contexts in the share group are destroyed, any use of the
CL context or command-queue(s) will result in undefined behavior, which may
include program termination. Applications should destroy the CL
command-queue(s) and CL context before destroying the corresponding GL share
group or contexts.</p>
</div>
<div class="paragraph">
<div class="title">Synchronizing OpenCL and OpenGL Access</div>
<p>In order to ensure data integrity, the application is responsible for
synchronizing access to shared CL/GL objects by their respective APIs.
Failure to provide such synchronization may result in race conditions and
other undefined behavior including non-portability between implementations.</p>
</div>
<div class="paragraph">
<p>Prior to calling <a href="clEnqueueAcquireGLObjects.html">clEnqueueAcquireGLObjects</a>, the application must
ensure that any pending GL operations which access the objects specified in
<em>mem_objects</em> have completed. This may be accomplished portably by issuing
and waiting for completion of a <code>glFinish</code> command on all GL contexts with
pending references to these objects. Implementations may offer more
efficient synchronization methods; for example on some platforms calling
<code>glFlush</code> may be sufficient, or synchronization may be implicit within a
thread, or there may be vendor-specific extensions that enable placing a
fence in the GL command stream and waiting for completion of that fence in
the CL command queue. Note that no synchronization methods other than
<code>glFinish</code> are portable between OpenGL implementations at this time.</p>
</div>
<div class="paragraph">
<p>When the extension <a href="cl_khr_egl_event.html">cl_khr_egl_event</a> is supported: Prior to calling
<a href="clEnqueueAcquireGLObjects.html">clEnqueueAcquireGLObjects</a>, the application must ensure that any
pending EGL or EGL client API operations which access the objects specified
in <em>mem_objects</em> have completed. If the <a href="cl_khr_egl_event.html">cl_khr_egl_event</a> extension
is supported and the EGL context in question supports fence sync objects,
<em>explicit synchronisation</em> can be achieved as set out in section 5.7.1. If
the <a href="cl_khr_egl_event.html">cl_khr_egl_event</a> extension is not supported, completion of EGL
client API commands may be determined by issuing and waiting for completion
of commands such as <code>glFinish</code> or <code>vgFinish</code> on all client API contexts with
pending references to these objects. Some implementations may offer other
efficient synchronization methods. If such methods exist they will be
described in platform-specific documentation. Note that no synchronization
methods other than <code>glFinish</code> and <code>vgFinish</code> are portable between all EGL
client API implementations and all OpenCL implementations. While this is the
only way to ensure completion that is portable to all platforms, these are
expensive operation and their use should be avoided if the
<a href="cl_khr_egl_event.html">cl_khr_egl_event</a> extension is supported on a platform.</p>
</div>
<div class="paragraph">
<p>Similarly, after calling <a href="clEnqueueReleaseGLObjects.html">clEnqueueReleaseGLObjects</a>, the application is
responsible for ensuring that any pending OpenCL operations which access the
objects specified in <em>mem_objects</em> have completed prior to executing
subsequent GL commands which reference these objects. This may be
accomplished portably by calling <a href="clWaitForEvents.html">clWaitForEvents</a> with the event object
returned by <a href="clEnqueueReleaseGLObjects.html">clEnqueueReleaseGLObjects</a>, or by calling <a href="clFinish.html">clFinish</a>.
As above, some implementations may offer more efficient methods.</p>
</div>
<div class="paragraph">
<p>The application is responsible for maintaining the proper order of
operations if the CL and GL contexts are in separate threads.</p>
</div>
<div class="paragraph">
<p>If a GL context is bound to a thread other than the one in which
<a href="clEnqueueReleaseGLObjects.html">clEnqueueReleaseGLObjects</a> is called, changes to any of the objects in
<em>mem_objects</em> may not be visible to that context without additional steps
being taken by the application. For an OpenGL 3.1 (or later) context, the
requirements are described in Appendix D ("Shared Objects and Multiple
Contexts") of the OpenGL 3.1 Specification. For prior versions of OpenGL,
the requirements are implementation-dependent.</p>
</div>
<div class="paragraph">
<p>Attempting to access the data store of an OpenGL object after it has been
acquired by OpenCL and before it has been released will result in undefined
behavior. Similarly, attempting to access a shared CL/GL object from OpenCL
before it has been acquired by the OpenCL command queue, or after it has
been released, will result in undefined behavior.</p>
</div>
<div class="paragraph">
<p>If the <a href="cl_khr_gl_event.html">cl_khr_gl_event</a> extension is supported,
then the OpenCL implementation will ensure that any such pending OpenGL
operations are complete for an OpenGL context bound to the same thread as
the OpenCL context. This is referred to as implicit synchronization.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">Errors</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Returns a valid non-zero OpenCL image object and <em>errcode_ret</em> is set to <code>CL_SUCCESS</code> if the image object is created successfully.
Otherwise, it returns a NULL value with one of the following error values returned in <em>errcode_ret</em>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>CL_INVALID_CONTEXT</code> if <em>context</em> is not a valid context or was not created from a GL context.</p>
</li>
<li>
<p><code>CL_INVALID_VALUE</code> if values specified in <em>flags</em> are not valid.</p>
</li>
<li>
<p><code>CL_INVALID_GL_OBJECT</code> if <em>renderbuffer</em> is not a GL renderbuffer object or if the width or height of <em>renderbuffer</em> is zero.</p>
</li>
<li>
<p><code>CL_INVALID_IMAGE_FORMAT_DESCRIPTOR</code> if the OpenGL renderbuffer internal format does not map to a supported OpenCL image format.</p>
</li>
<li>
<p><code>CL_INVALID_OPERATION</code> if <em>renderbuffer</em> is a multi-sample GL renderbuffer object.</p>
</li>
<li>
<p><code>CL_OUT_OF_RESOURCES</code> if there is a failure to allocate resources required by the OpenCL implementation on the device.</p>
</li>
<li>
<p><code>CL_OUT_OF_HOST_MEMORY</code> if there is a failure to allocate resources required by the OpenCL implementation on the host.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See Also</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="cl_khr_gl_sharing.html">cl_khr_gl_sharing</a>,
<a href="clCreateBuffer.html">clCreateBuffer</a>,
<a href="cl_image_format.html">cl_image_format</a>,
<a href="clRetainMemObject.html">clRetainMemObject</a>,
<a href="clReleaseMemObject.html">clReleaseMemObject</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_document_notes">Document Notes</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For more information, see the OpenCL Extension Specification at URL</p>
</div>
<div class="paragraph">
<p><a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_Ext.html#clCreateFromGLRenderbuffer" class="bare">https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_Ext.html#clCreateFromGLRenderbuffer</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_copyright">Copyright</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright (c) 2014-2020 Khronos Group. This work is licensed under a
<a href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons
Attribution 4.0 International License</a>.</p>
</div>
</div>
</div>
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